Counteracting spam by limiting comments

This kind of crap has been showing up on posts on the blog. Comments for this blog do not require prescreening, but they all do come to my emailbox for review, so on some mornings I have to wade through a dozen of these

...i want to thank you for your work. You have done really very good site. Great work, great site! Thank you!

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Sorry for offtopic

Some mornings I will find that same entry on ten different posts dating back over the past two years. And then I have to individually go to each post where the crap was posted and manually delete it. It's a pain in the cyberbutt and I just don't have time for this anymore.

So I'm switching the comment system on the blog to require registration. For the moment I'm not going to require the retyping of a "captcha" image to screen out bots - but that will be the next step if necessary.

Please understand that I am NOT making the switch to squeeze out those who in the past have posted as "anonymous." Many of those comments have been outstanding, and I fully understand that some people prefer not to use any system to register. But this spam has gotten to be too much of a hassle. I'm "Minnesota-nice," but I just can't take it any more.